Incorrect Value

Question

Hi

  I have below code . I have attached image. When i loop thru Gridview it should show Data value but it shows  

When i am tryying this it gives error - Object reference mot set to an instance of the Object.

foreach (GridViewRow gr in grdPlanning.Rows)
{
    //string sessionDate = "";
    if (gr.RowType == DataControlRowType.DataRow)
    {

        if (gr.Cells[0].Text == "146")
        {
            string sign5 = ((TextBox)gr.FindControl("txtDate")).Text;
        }
    }
}

protected void gr_RowDataBound(object sender, GridViewRowEventArgs e)
{
    try
    {
        if (e.Row.RowType != DataControlRowType.DataRow)
            return;
        e.Row.Cells[0].HorizontalAlign = HorizontalAlign.Center;

        TextBox txtDate = new TextBox();
        txtDate.CssClass = "form-control";
        txtDate.DataBind();
        e.Row.Cells[e.Row.Cells.Count - 1].Controls.Add(txtDate);
    }
}

Thanks